| Acronym | Meaning |
 | WFPC | Wide Field/Planetary Camera |
| FTS | Flight Telerobotic Servicer |
| IGM | InterGalactic Medium |
| GRU | Glavnoye Razvedivatel'noye Upravileniye |
| DDTE | Design |
| NACA | National Advisory Committee On Aeronautics |
| DACS | DATA Acquisition And Control Subsystem |
| LHA | Local Hour Angle |
| ENAP | Energetic Neutral Atom Precipitation |
| CBR | Cosmic Background Radiation |
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